Remove stylesheet injection from Blink.

Source/platform/blink_platform.gypi

 {
   'includes': [
     'platform_generated.gypi',
   ],
   'variables': {
     'platform_files': [
       'AsyncFileSystemCallbacks.h',
       'CalculationValue.h',
       'CheckedInt.h',
       'Clock.cpp',
@@ skipping 113 matching lines @@
       'Theme.h',
       'ThemeTypes.h',
       'ThreadedDataReceiver.h',
       'ThreadTimers.cpp',
       'ThreadTimers.h',
       'Timer.cpp',
       'Timer.h',
       'TraceEvent.h',
       'TracedValue.cpp',
       'TracedValue.h',
-      'URLPatternMatcher.cpp',
-      'URLPatternMatcher.h',
       'UUID.cpp',
       'UUID.h',
       'UserGestureIndicator.cpp',
       'UserGestureIndicator.h',
       'WebThread.cpp',
       'WebThreadSupportingGC.cpp',
       'WebThreadSupportingGC.h',
       'Widget.cpp',
       'Widget.h',
       'WindowsKeyboardCodes.h',
@@ skipping 853 matching lines @@
       'image-decoders/webp/WEBPImageDecoderTest.cpp',
     ],
     'platform_unittest_support_files': [
       'testing/URLTestHelpers.cpp',
       'testing/URLTestHelpers.h',
       'testing/UnitTestHelpers.cpp',
       'testing/UnitTestHelpers.h',
     ],
   },
 }